Being nice is you only trying to be nice even when you're not. "It's delicious!" when someone gives you food you tried to make a good reaction to food in fact you taste it badly. You tried to be nice to look good to others.
Try to practice kindness to others. Being kind is when you're doing good for the benefit of others without waiting for payback. We can be a good seed to others instead of a toxic one. Toxic means you're indifferent to others in a bad way.
Respect is Kindness
Being respectful it starts by yourself, respect yourself and you could do it to others. At work, we can work without noticing our co-worker works if it's not necessary. Give her advice if needed instead of gossiping her to others. In the neighborhood, when people noticed that someone almost perfection, the more they gossip. Why don't we just let her in peace, instead of gossip make her as an inspiration to you, so that you will be in her level too?
Being helpful without waiting for payback is kindness
There are different kinds of "help" for being helpful. It can be physically, emotionally, mentally, and spiritually. We can help with those four aspects of life. Help without asking for a return.
Listening to those who need a listener
Listen when someone needs a listener. Someone who needs to talk to and you listen it means a lot to her, and this acts that your being kind to her. Listening to others will give them comfort, it relieves their pain.
“Carry out a random act of kindness, with no expectation of reward, safe in the knowledge that one day someone might do the same for you.” – Princess Diana
This is very timely. I hope I got what you mean here.